57
High-pressure switch open with inducer high (shared diagnostic path with 45)
This code typically points to
- High-pressure switch not proving at high inducer speed
- IDM issue
- Wiring issue
Next checks to confirm
- Public snippet explicitly says: code 45 or 57 — check IDM
- Verify voltage to IDM high-speed tap
- Check run capacitor and wiring
Escalation
Heating sequence terminates
Reset behavior
Clears when proving is restored.
Urgent
Fix now